chore: unify load-rules.ts and utils/rules.ts to rules/index.ts

[Foxeye-Rinx]

• The load-rules.ts and utils/rules.ts are working like an index, using an index file in src/rules/ allows us to remove them
• The update-rules.ts is the generator of utils/rules.ts so it can be removed too

[changeset-bot]

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Latest commit: 6dcd659

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[ota-meshi]

Hmm... Will src/rules/index.ts need to be maintained manually after this change?
If so, I don't want to maintain src/rules/index.ts manually, since rules are often added via pull requests from contributors.

[Foxeye-Rinx]

I just created the #439 that might meet our expectations. I also added some minor improvements. Could you take a look and help me review the js import, I don't understand it so well.